LTC3218

3

3218fb

LED CURRENT (mA)

0

0

0.001

0.003

0.004

0.005

0.009

0.002

200

100

300

400

0.006

0.007

0.008

3218 G01

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: Based on long-term current density limitations. Assumes an

operating duty cycle of ≤ 10% under Absolute Maximum Conditions

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Charge Pump (CPO)

Charge Pump Output Clamp Voltage

5.3

V

1:1 Mode Output Impedance

1.3

Ω

1:2 Mode Output Impedance

7Ω

CLK Frequency

1MHz

CPO Short Circuit Detection

Threshold Voltage

ENT = HIGH

●

0.6

1.5

V

Test Current

●

20

50

mA

ENF, ENT

●

1.4

V

●

0.4

V

●

14.4

30

μA

●

–1

1

μA

Flash Timeout

ENF = HIGH

2

s

ISETF, ISETT

●

1.18

1.21

1.24

V

ENT = LOW, ENF = HIGH

●

181

μA

for durations less than 10 seconds. Maximum current for continuous

operation is 150mA.

Note 3: The LTC3218E is guaranteed to meet performance specifications

from 0°C to 85°C. Specifications over the –40°C to 85°C ambient

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

otherwise noted.

TYPICAL PERFORMANCE CHARACTERISTICS

vs LED Current

0

0

50

150

200

250

200

450

100

100

50

250

300

150

350

300

350

400

3218 G02

TORCH

FLASH (ENT = LOW,

ENF = HIGH)

FLASH (ENT = ENF = HIGH)

2.9

4.5

3.3

3.7

4.1

3.1

3.5

3.9

4.3

3218 G03

0

0.5

1.5

2.0

2.5

3.0

1.0

T = –40°C

T = 25°C

T = 85°C